[Feature] Specify per-request hooks

[williamboman]

Hey! I'd like to be able to provide custom hooks on a per-request basis. An example of this would be to create a keymap to only view references within the current buffer, for which I'd exclude any items whose bufnr != current_bufnr. I was not able to find a way to make this work currently.

What I had in mind was adding a 2nd parameter to .open(method, opts), like so:

require("glance").open("references", {
  hooks = {
     before_open = function (results, open, jump, method)
         -- filter results and open()
     end,
  }
})

I'd be happy to contribute with a PR if you think the above approach would make sense.

[williamboman]

I decided to take a stab at implementing this for local use, see #48.